use margin instead of padding so that TextBox_sizes.a11y.quirks test doesn't fail, fixes #13544.
use margin instead of padding so that TextBox_sizes.a11y.quirks test doesn't fail, fixes #13544.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@26200 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful